AggregationMatcher.java
/*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.facebook.presto.sql.planner.assertions;
import com.facebook.presto.Session;
import com.facebook.presto.cost.StatsProvider;
import com.facebook.presto.metadata.Metadata;
import com.facebook.presto.spi.plan.AggregationNode;
import com.facebook.presto.spi.plan.AggregationNode.Step;
import com.facebook.presto.spi.plan.PlanNode;
import com.facebook.presto.spi.relation.VariableReferenceExpression;
import com.facebook.presto.sql.planner.Symbol;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.Set;
import java.util.stream.Collectors;
import static com.facebook.presto.sql.planner.assertions.MatchResult.NO_MATCH;
import static com.facebook.presto.sql.planner.assertions.MatchResult.match;
import static com.google.common.base.MoreObjects.toStringHelper;
import static com.google.common.base.Preconditions.checkState;
import static com.google.common.collect.ImmutableList.toImmutableList;
import static com.google.common.collect.ImmutableSet.toImmutableSet;
public class AggregationMatcher
implements Matcher
{
private final PlanMatchPattern.GroupingSetDescriptor groupingSets;
private final Map<Symbol, Symbol> masks;
private final List<String> preGroupedSymbols;
private final Optional<Symbol> groupId;
private final Step step;
public AggregationMatcher(PlanMatchPattern.GroupingSetDescriptor groupingSets, List<String> preGroupedSymbols, Map<Symbol, Symbol> masks, Optional<Symbol> groupId, Step step)
{
this.groupingSets = groupingSets;
this.masks = masks;
this.preGroupedSymbols = preGroupedSymbols;
this.groupId = groupId;
this.step = step;
}
@Override
public boolean shapeMatches(PlanNode node)
{
return node instanceof AggregationNode;
}
@Override
public MatchResult detailMatches(PlanNode node, StatsProvider stats, Session session, Metadata metadata, SymbolAliases symbolAliases)
{
checkState(shapeMatches(node), "Plan testing framework error: shapeMatches returned false in detailMatches in %s", this.getClass().getName());
AggregationNode aggregationNode = (AggregationNode) node;
if (groupId.isPresent() != aggregationNode.getGroupIdVariable().isPresent()) {
return NO_MATCH;
}
if (!matches(groupingSets.getGroupingKeys(), aggregationNode.getGroupingKeys(), symbolAliases)) {
return NO_MATCH;
}
if (groupingSets.getGroupingSetCount() != aggregationNode.getGroupingSetCount()) {
return NO_MATCH;
}
if (!groupingSets.getGlobalGroupingSets().equals(aggregationNode.getGlobalGroupingSets())) {
return NO_MATCH;
}
List<VariableReferenceExpression> aggregationsWithMask = aggregationNode.getAggregations()
.entrySet()
.stream()
.filter(entry -> entry.getValue().getMask().isPresent())
.map(Map.Entry::getKey)
.collect(Collectors.toList());
if (aggregationsWithMask.size() != masks.keySet().size()) {
return NO_MATCH;
}
Set<Symbol> maskToAlias = masks.keySet().stream().map(x -> new Symbol(symbolAliases.get(x.getName()).getName())).collect(Collectors.toSet());
for (VariableReferenceExpression variable : aggregationsWithMask) {
if (!masks.keySet().contains(new Symbol(variable.getName())) && !maskToAlias.contains(new Symbol(variable.getName()))) {
return NO_MATCH;
}
}
if (step != aggregationNode.getStep()) {
return NO_MATCH;
}
if (!matches(preGroupedSymbols, aggregationNode.getPreGroupedVariables(), symbolAliases)) {
return NO_MATCH;
}
return match();
}
static boolean matches(Collection<String> expectedAliases, Collection<VariableReferenceExpression> actualVariables, SymbolAliases symbolAliases)
{
if (expectedAliases.size() != actualVariables.size()) {
return false;
}
List<String> expectedSymbolNames = expectedAliases
.stream()
.map(alias -> symbolAliases.get(alias).getName())
.collect(toImmutableList());
Set<String> actualVariableNames = actualVariables.stream().map(VariableReferenceExpression::getName).collect(toImmutableSet());
for (String symbolName : expectedSymbolNames) {
if (!actualVariableNames.contains(symbolName)) {
return false;
}
}
return true;
}
@Override
public String toString()
{
return toStringHelper(this)
.add("groupingSets", groupingSets)
.add("preGroupedSymbols", preGroupedSymbols)
.add("masks", masks)
.add("groupId", groupId)
.add("step", step)
.toString();
}
}